SAT® · Reading and Writing: Information and Ideas
True but Unsupported Answer Choices
On this test, an answer choice must be stated or directly shown in the passage, not just true in real life. A fact you know from class but the text never mentions is automatically wrong.
Each reading question draws an invisible fence around its passage. The only evidence that counts is what's inside that fence: words, numbers, and claims actually printed on the page. The test writers build wrong answers on purpose by taking true, verifiable facts from the real world and planting them just outside that fence. If the passage is about Roman roads and never mentions the fall of Rome, then 'Rome fell in 476 CE' is disqualified the moment you check it against the text, no matter how correct it is.
This is why outside knowledge can actively hurt you. A student who knows a lot about photosynthesis is more likely to recognize a true statement about rubisco or carbon fixation that the passage itself never makes, and to pick it out of confidence rather than evidence. The question isn't testing what you know about the subject. It's testing whether you can tell the difference between what a specific text says and what you happen to believe is true. Every time you look at a choice, the only question is: does the passage say this, or something close enough to count as saying this?
This skill sits right next to finding central ideas and drawing inferences, because both depend on staying inside the same fence. A supported inference still has to be built from details the passage gives you; a true-but-unsupported choice fails at the exact same checkpoint, just one step earlier. Once you're in the habit of asking 'where in the text is this,' both skills get easier.
Key terms
- Textual evidence
- A detail, claim, or number that the passage itself states, which alone can support a correct answer.
- Unsupported choice
- An answer choice that is true or plausible but is never actually stated or shown in the passage.
- The fence
- The boundary of the passage itself, outside of which outside knowledge and unstated facts don't count as evidence.
- Outside knowledge
- Information a reader brings from elsewhere, such as class or general facts, rather than from the passage.
Watch it explained
- How it worksHow does the SAT fence off a text so that everything you learned in class sits outside the boundary?
- Common mistakeWhy doesn't knowing more about photosynthesis help you on a reading question about photosynthesis?
- Worked exampleFind the flaw when a text on Roman road-building is answered with 'Rome fell in 476 CE' - true, but never stated.
Check yourself
End of topic.